MHSC Post October 2019 Owner's manual

1

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

Models:

Installation/Owner’s Manual

Appliance Setup, Care and Operation

NOTICE: DO NOT discard this manual!

In the Commonwealth of Massachusetts installation must be

performed by a licensed plumber or gas tter.

See appliance installation manual for additional

Commonwealth of Massachusetts requirements.

INSTALLER: Leave this manual with party responsible for use and operation.

OWNER: Retain this manual for future reference.

Contact your dealer with questions regarding installation, operation or service.

• DO NOT store or use gasoline or other am-

mable vapors and liquids in the vicinity of this

or any other appliance.

• What to do if you smell gas

- DO NOT try to light any appliance.

- DO NOT touch any electrical switch. DO

NOT use any phone in your building.

- Leave the building immediately.

- Immediately call your gas supplier from

a neighbor’s phone. Follow the gas sup-

plier’s instructions.

- If you cannot reach your gas supplier, call

the re department.

• Installation and service must be performed

by a qualied installer, service agency, or the

gas supplier.

WARNING:

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings exactly

could result in serious injury, death, or

property damage.

NB18NV/PV

NB24NV/PV

NB18NIF/PIF

NB24NIF/PIF

Natural Blaze Series

• DO NOT install this unit in a bedroom or

bathroom.

810107

NB18/24 cover

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/232

Safety Alert Key:

• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.

• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.

• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

• NOTICE: Used to address practices not related to personal injury.

Table of Contents

Installation Standard Work Checklist ....................3

1 Product Specic & Important Safety Information

A. Appliance Certication ............................4

B. BTU Specications and Weight .....................4

C. Gas Pressures ..................................4

D. High Altitude Installations ..........................4

E. Non-Combustible Materials Specication. . . . . . . . . . . . . . 4

2 Getting Started

A. Design and Installation Considerations ...............5

B. Tools and Supplies Needed ........................5

C. Inspect Appliance and Components .................. 5

D. Check Parts ....................................6

E. Installation Information ............................6

F. Adequate Combustion Ventilation Air .................7

3 Clearances & Height Requirements

A. Clearances & Height Requirements ..................9

B. Before Installing the Appliance ..................... 13

C. Damper Stop Installation .........................13

D. Assembly Procedure ............................14

4 Gas Information

A. Gas Line Connection ............................15

B. Fuel Type .....................................15

C. Gas Pressure .................................. 15

D. Gas Service Access .............................16

E. Check Gas Pressure ............................16

5 Electrical Information

A. General Information .............................17

B. Connect Optional Wall Switch or Thermostat ..........18

C. Connect Remote Receiver ........................19

D. Check System Operation ......................... 19

E. Wiring Requirements ............................20

F. Detailed Component Operating Instructions ..........21

6 Gas Log Set

A. Grate & Log Installation ..........................22

B. Log Placement (Berkley Oak) ..................... 23

C. Log Placement (Highland Oak) ....................25

D. Log Placement (Stoney Creek) ....................26

E. Log Placement (Beachcomber) ....................28

F. Flame Appearance .............................. 29

G. Operating Instructions ...........................29

7 Owner’s Manual

A. Congratulations ................................ 31

B. Limited Lifetime Warranty .........................32

8 Product Specication Information

A. Application Certication ..........................34

B. BTU Specications and Weight ....................34

9 Important Safety & Operating Information

A. Appliance Safety ............................... 35

B. General Operating Parts ......................... 37

C. Fuel Specications ..............................37

D. Before Lighting Appliance. . . . . . . . . . . . . . . . . . . . . . . . . 37

10 Lighting Instructions

A. Millivolt .......................................38

B. Intellire Plus ODS (IFP) .........................41

C. Initial Use .....................................43

11 IntelliFire Plus

A. RC300 Remote Control ..........................44

12 Maintenance & Service

A. Maintenance: Frequency & Tasks ................. 48

B. Maintenance Tasks: Qualied Service Technician .....48

C. Burner Ignition & Operation .......................48

D. Cleaning & Servicing ............................49

13 Troubleshooting

A. Millivolt Control System .......................... 50

B. IntelliFire Plus ODS Ignition System ................51

14 Service Parts & Accessories

A. Service Parts ..................................53

B. Accessories ...................................71

C. Contact Information .............................73

NOTE: Monessen vent free gas logs are hand painted

for ultimate beauty and realism. As a result, some

variation in color and shading will occur from set to set.

This is intentional and designed to make each product

unique, as found in nature.

►

3

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

Installation Standard Work Checklist

Gas Section 4

Proper appliance for fuel type.

Leak check performed and inlet pressure verified.

Verified proper air shutter setting for installation type.

Customer:

Lot/Address:

Model (circle one): NB18NV,NB18PV,NB18NIF,NB18PIF

NB24NV,NB24PV,NB24NIF,NB24PIF

Date Installed:

Location of Fireplace:

Installer:

Dealer/Distributor Phone #

Serial #:

Comments: Further description of the issues, who is responsible (Installer/ Builder/ Other Trades, etc) and corrective

action needed _____________________________________________________________________________________

Comments Communicated to party responsible ____________________ by ______________________on ___________

(Builder / Gen. Contractor/) (Installer) (Date)

?YHW , ON F I SEY

___________________________

Gas Log Install Sections 2 and 5

Verified that the chimney has been cleaned. (pg. 13)

Verifi ed clearances to combustibles.

Gas Logs are leveled and secured.

See page 8 for adequate provisions for combustion and ventilation

air have been verified.

___________________________

Finishing Section 3

Verifi ed all clearances meet installation manual requirements.

Mantels and wall projections comply with installation manual requirements.

___________________________

Manual bag and all of its contents are removed and the log set

given to party responsible for use and operation.

Started log set and veried no gas leaks exist.

___________________________

4619-982 08/19

 = Contains updated information.

Hearth & Home Technologies recommends the following:

• Photographing the installation and copying this checklist for your file.

• That this checklist remain visible at all times on the appliance until the installation is complete.

This standard work checklist is to be used by the installer in conjunction with, not instead of, the instructions contained in this

installation manual.

WARNING! Risk of Fire or Explosion! Failure to install appliance according to these instructions could

lead to a fire or explosion.

ATTENTION INSTALLER:

Follow this Standard Work Checklist

Embers & Logs Section 6

All packaging and protective materials removed (inside & outside of appliance).

Embers and logs installed correctly.

Accessories installed properly.

Electrical Section 5

Switch wires properly installed.

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/234

This product is listed to ANSI standards for "Unvented

Room Heaters” and applicable sections of "Gas Burning

Heating Appliances for Manufactured Homes" and "Gas

Fired Appliances for Use at High Altitude."

A. Appliance Certication

E. Non-Combustible Materials Specication

Material which will not ignite and burn. Such materials are

those consisting entirely of steel, iron, brick, tile, concrete,

slate, glass or plasters, or any combination thereof.

Materials that are reported as passing ASTM E 136,

Standard Test Method for Behavior of Materials in

a Vertical Tube Furnace at 750 ºC shall be considered

non-combustible materials.

NOT INTENDED FOR USE AS A PRIMARY HEAT SOURCE.

This appliance is tested and approved as either supplemen-

tal room heater or as a decorative appliance. It should not

be factored as primary heat in residential heating calcula-

tions.

NOTICE: This installation must conform with local codes.

In the absence of local codes you must comply with the

National Fuel Gas Code, ANSI Z223.1-latest edition in

the U.S.A.

1 1 Product Specic and Important Safety Information

B. BTU Specications and Weight D. High Altitude Installations

NOTICE: If the heating value of the gas has been reduced,

these rules do not apply. Check with your local gas utility

or authorities having jurisdiction.

When installing above 2000 feet elevation: Reduce input

rate 4% for each 1000 feet above sea level.

Check with your local gas utility to determine proper

orice size.

MODEL: NB18NV/PV, NB24NV/PV, NB18NIF/PIF

NB24NIF/PIF

LABORATORY: CSA

TYPE: Unvented Room Heater

STANDARD: ANSI Z21.11.2:19 Gas-red Unvented Room

Heaters

ANSI Z21.60-2017∙CSA 2.26-2017 (Decorative

Gas Appliances for Installation in Solid-Fuel

Burning Fireplaces)

Models

Maximum

Input

BTU/h

Minimum

Input

BTU/h

Orice Weight

Pounds

NB18NV (0-2000 FT) 28,000 19,000 #38 25

NB18PV (0-2000 FT) 27,000 22,000 #52 25

NB24NV (0-2000 FT) 37,000 25,000 3.00 mm 28

NB24PV (0-2000 FT) 36,000 28,000 #49 28

NB18NIF (0-2000 FT) 28,000 19,000 #38 26

NB18PIF (0-2000 FT) 27,000 22,000 #52 26

NB24NIF (0-2000 FT) 37,000 25,000 3.00 mm 27.5

NB24PIF (0-2000 FT) 36,000 28,000 #49 27.5

NOTE: For LP models an external regulator is required

to reduce supply pressure to a maximum of 13" w.c.

NATURAL PROPANE (LP)

Inlet Minimum 5.0" w.c. 11.0" w.c.

Inlet Maximum 10.5" w.c. 13.0" w.c.

Gas Valve Manifold

Pressure Setting

3.5" w.c. 10" w.c.

Pilot Regulator 3.5" w.c. —

NATURAL GAS: An external regulator is required to reduce

supply pressure to a maximum of 101⁄2" w.c. on natural gas

systems operating at higher pressure.

PROPANE/LPG: An external regulator is required to reduce

supply pressure to a maximum of 13" w.c.

Pilot/ODS

The gas log heater is tted with a specially designed safety

pilot (ODS assembly) which senses the amount of oxygen

available in the room and shuts the gas log heater off if the

oxygen level begins to drop below a satisfactory level. The

pilot can only be relit when adequate fresh air is available.

C. Gas Pressures

5

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

2 2 Getting Started

A. Design and Installation Considerations

Installation MUST comply with local, regional, state and

national codes and regulations. Consult insurance carrier,

local building inspector, re ofcials or authorities having

jurisdiction over restrictions, installation inspection and

permits.

Before installing, determine the following:

• Where burner assembly and log set are to be installed.

• Gas supply piping.

• Whether optional accessories—devices such as a wall

switch or remote control—are desired.

• Approved wood burning masonry replace or vent-free

replace.

Improper installation, adjustment, alteration, service or

maintenance can cause injury or property damage. For

assistance or additional information, consult a qualied

service technician, service agency or your dealer.

Installation and service of this appliance should

be performed by qualied personnel. Hearth

& Home Technologies recommends HHT

Factory Trained or NFI certied professionals.

C. Inspect Appliance and Components

• Carefully remove the appliance and components from

the packaging.

• Logs are packaged and sold separately.

• Report to your dealer any parts damaged in shipment.

• Read all of the instructions before starting the instal-

B. Tools and Supplies Needed

Before beginning the installation be sure that the following

tools and building supplies are available.

• Tape measure

• Gloves

• Voltmeter

• Manometer

• Phillips screwdriver

• Safety glasses

• Flat blade screwdriver

• Soapy water solution for gas leak testing

• Electric drill and bits (1/4 in. magnetic)

• External regulator (for propane/LPG only & 1/2 psi

Natural gas system

• Piping which complies with local codes

• Pipe sealant approved for use with propane/LPG

(Resistant to sulfur compounds)

Hearth & Home Technologies disclaims any responsibility

for, and the warranty will be voided by, the following actions:

• Installation and use of any damaged appliance.

• Modication of the appliance.

• Installation other than as instructed by Hearth & Home

Technologies.

• Installation and/or use of any component part not approved

by Hearth & Home Technologies.

Any such action may cause a re hazard.

WARNING! Risk of Fire, Explosion or Electric Shock!

DO NOT use this appliance if any part has been under

water. Call a qualied service technician to inspect the

appliance and to replace any part of the control system

and/or gas control which has been under water.

• Manual shutoff valve

• Sediment trap

• Tee joint

• Pipe wrench

lation. Follow these instructions carefully during the

installation to ensure maximum safety and benet.

WARNING! Risk of Fire or Explosion! Damaged parts

could impair safe operation. DO NOT install damaged, in-

complete or substitute components. Keep appliance dry.

Gloves are recommended when handling

refractory and logs to prevent skin irritation

from loose bers. Logs are fragile; handle

with care.

CAUTION

WARNING: This product and the

fuels used to operate this product (liquid

propane or natural gas), and the products

of combustion of such fuels, can expose

you to chemicals including benzene, which

is known to the State of California to cause

cancer and reproductive harm. For more

information go to: www.P65Warnings.

ca.gov.

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/236

E. Installation Information

Use manufacturer's installation and clearance require-

ments as dened in their manual.

This Gas-Fired Unvented Gas Log Type Room Heater is

approved for installation into a CSA/ANSI Z21.91:20 listed

Ventless Firebox Enclosure for Gas-Fired Unvented Gas

Log Type Room Heaters, so long as the rebox hearth

dimensions meet the minimum hearth dimensions listed

in this manual.

A

C

D

B

Figure 2.1 - Minimum Dimensions for Engine, Logs &

Firebox

This appliance is for installation only in a solid-fuel

burning masonry or UL127 factory-built replace

or in listed ventless rebox enclosure. It has been

design certied for these installations.

Exception: DO NOT install this appliance in a factory-

built replace that includes instructions stating

it has not been tested or should not be used with

unvented gas logs.

WARNING

D. Check Parts

Verify contents to ensure you have received all parts. You

should have the following:

NB Models

• Unvented gas log burner assembly

• Two (2) bags of crushed volcanic rock

• Installation/operating instructions

• Two (2) Anchoring Screws

• Ceramic ber or refractory logs

• Rock wool

• Grate assembly

• On/off log switch assembly (MV models only)

• RC300 remote control (IFP models only)

• Double A batteries (IFP models only)

The following options may be used with the millivolt con-

trolled heater. These options are not packaged with the

log set.

• Hand-held remote with receiver (MV)

• Wall switch with 15' wire

• HILOKTN/P (an accessory kit for ame adjustment

from a hand held remote)

Carefully inspect the contents for shipping damage. If any

parts are missing or damaged, immediately inform the

dealer from whom you purchased the appliance. Do not

attempt to install any part of the appliance unless you

have all parts in good condition.

Placement in Fireplace with a Restrictive Barrier

The following are guidelines for placing a gas log set in a

replace that has a restrictive barrier on the replace for

vented appliance only. See Figure 2.2.

Height of Restriction

(x)

Minimum Depth of

Fireplace/Firebox

No Restriction 13"

0" to 3" 16"

Greater than 3" *

*Any barrier greater than 3" placed in front of the gas log set is not

recommended by the manufacturer.

NOTE: Non-combustible material such as refractory brick

may be used to line the oor of the replace in order to raise

the height of the gas log set in relation to a restrictive barrier.

If the unit is raised, the minimum height dimension listed

in the homeowner’s manual must be met or exceeded.

NOTE: If the log set is equipped with a remote receiver, a

restrictive barrier may reduce the battery life by increasing

the ambient temperature inside the replace. Placement

of the receiver outside of the replace will extend the

battery life.

Model A B C D

NB18 w/18" Log 26" 13" 18" 17"

NB24 w/24" Log 29" 13" 221⁄4" 17"

NB24 w/30" Log 33" 13" 251⁄4" 17"

NB18IF w/18" Log 281⁄2" 13" 201⁄4" 17"

NB24IF w/24" Log 31" 13" 251⁄4" 17"

NB24IF w/30" Log 35" 13" 251⁄4" 17"

7

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

Do not install the heater:

• Where curtains, furniture, clothing, or

other ammable objects are less than

36" from the front of the heater.

• In high trafc areas.

• In windy or drafty areas.

WARNING

Gloves are recommended when handling

logs to prevent skin irritation from loose

bers. Logs are fragile—handle with care.

Barriers such as the bottom of a glass door frame

placed in front of a gas log set can change the air

ow characteristics of the replace which in turn

can cause the unit to overheat and malfunction when

installed as a vented log set.

WARNING

Glass door frames with adjustable louvers

should have the louvers fully open while

the unit is in operation

Depth of re-

place/rebox

(Refer to table)

The log set should be placed against

or as near as possible to the rear

wall of the replace/rebox.

Height of restrictive barrier caused by glass

door frames, recessed replaces, etc. from

the base or bottom surface of the unit.

(Refer to table)

Figure 2.2 - Reference Drawing of a Natural Flame Log Set in

an Enclosure with Glass Door or Barrier Installed

F. Adequate Combustion Ventilation Air

This heater shall not be installed in a conned space or

unusually tight construction unless provisions are provided

for adequate combustion and ventilation air.

The National Fuel Gas Code, (ANSI Z223.1/NFPA54),

denes a conned space as a space whose volume is less

than 50 cubic feet per 1,000 BTU per hour (4.8m3 per kw)

of the aggregate input rating of all appliances installed in

that space, and an unconned space as a space whose

volume is not less than 50 cubic feet per 1,000 BTU per

hour (4.8 m3 per kw) of the aggregate input rating of all

appliances installed in that space. Rooms communicat-

ing directly with the space in which the appliances are

installed, through openings not furnished with doors, are

considered a part of a conned space.

Unusually tight construction is dened as construction

where:

a. Walls and ceilings exposed to the outside atmosphere

have a continuous water vapor retarder with a rating of

1 perm (6 x 1011 kg per pa/sec-m2) or less with openings

gasketed or sealed, and

b. Weather stripping has been added to windows and

doors, and

c. Caulking or sealants are applied to areas such as joints

around window and door frames, between sole plates

and oors, between wall-ceiling joints, between wall

panels, at penetrations for plumbing, electrical and gas

lines and other openings.

The following formula can be used to determine the maxi-

mum heater rating per the denition of unconned space:

Refer to Figure 2.3.

BTU/Hr = (L1 + L2) Ft x (W) Ft x (H) Ft

50

Consider two connecting rooms with an open area

between, with the following dimensions:

L1 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.

BTU/Hr = (151/2 + 12) x (12) x (8)

50

If there were a door between the two rooms the calculation

would be based only on the room with the heater.

BTU/Hr = (151/2) x (12) x (8)

50

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/238

If the area in which the heater may be

operated does not meet the required volume

for indoor combustion air, combustion and

ventilation air shall be provided by one

of the methods described in the National

Fuel Gas Code, ANSI Z223.1/NFPA 54, the

International Fuel Gas Code or applicable

local codes.

WARNING

W

H

Counter

Fireplace

Figure 2.3

9

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

3 3 Clearances and Height Requirements

Sidewall and ceiling clearances: The sides of the re-

place opening must be at least 16" from any combustible

wall. The ceiling must be at least 42" from the top of the

replace opening.

Heat resistant material (minimum requirements) with

no wooden mantel or other combustible projection:

To install the gas logs into a replace with no wooden

mantel, shelf or other combustible projection above the

replace opening, measure the heat resistant material

height, according to Figure 3.2 and TABLE A.

Heat resistant materials such as slate and marble must be

at least 1/2" thick. Sheet metal should not be installed

onto combustible material.

IMPORTANT: If you cannot meet these minimum clear-

ances you must operate the heater with chimney ue

damper open. Refer to “Installing Vented Applications”

found on page 13.

FP2254

measure heat resist

Heat resistant

Material

Measure

This

Distance

Heater in

Fireplace/

Firebox

Figure 3.2 - Measure Heat Resistant Material

Table A — Heat Resistant Material Requirements with No Mantel or Combustible Projection

Heat Resistant Material

Measurement

Requirements for Safe Installation

NB18 NB24

12" or more Hood not required Hood not required

8" or less than 12" Hood not required Extend heat resistant material to 12" or install hood. Figure 3.3

Less than 8" Extend heat resistant

material to 8” AND

install hood. Figure 3.3

Extend heat resistant material to 8" AND install hood Figure 3.5.

OR Extend heat resistant material to a height of at least 12".

16"

42"

Figure 3.1 - Sidewall and Ceiling Clearances

The dimensions shown in Figures 3.1 through

3.8 and defined in the fireplace manufacturer's

instructions are minimum clearances to maintain

when installing this heater. Left and right clearances

are determined when facing the front of the heater.

When heater is installed into a ventless rebox,

minimum clearances, as specied by the ventless

rebox manufacturer, must be met.

Follow these instructions carefully to ensure safe

installation. Failure to follow instructions exactly

can create a re hazard.

WARNING

A. Clearances and Height Requirements

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/2310

Heat resistant material (minimum requirements) with

wooden mantel or other combustible projection:

To install the heater with a wooden mantel, shelf or other

combustible projection above, rst measure the heat resis-

tant material shown in Figure 3.3, then refer to Table B.

FP2255

measure heat resist

Hood

Heater in Fireplace

or Firebox

8" or More

of Heat

Resistant

Material

Figure 3.3 - Measuring Heat Resistant Material for Mantel

Table B - Heat Resistant Material Requirements Height and Mantel Location

Heat Resistant

Material

Measurement

Requirements for Safe Installation with Wooden Mantel, Shelf or other Combustible

Projection

NB18 NB24

12" or more Hood not required. Observe proles (side

elevations) shown in Figure 3.6 .

Hood not required. Observe prole (side

elevations shown in Figure 3.6 .

8" or less than 12" Install hood and observe proles shown

in Figure 3.5 OR Extend heat resistant

material to at least 12" and observe proles

shown in Figure 3.6.

Install hood and observe proles shown

in Figure 3.5 . OR Extend heat resistant

material to at least 12" and observe proles

shown in Figure 3.6.

Less than 8" Extend heat resistant to at least 8", install

hood and observe proles shown in Figure

3.5 . OR Extend heat resistant material to

at least 12" and observe proles shown in

Figure 3.6.

Extend heat resistant material to least 8",

install hood and observe proles shown

in Figure 3.5 . OR Extend heat resistant

material to at least 12" and observe proles

shown in Figure 3.6.

11

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

Figure 3.5 - Minimum Mantel Clearance with Hood — All

Models

Example: A mantel may project from the wall a maximum

of 21⁄2" at a minimum of 8" above the opening, and a

maximum of 6" at a minimum of 141⁄2" above the opening.

10"

8"

6"

2¹⁄₂"

8" 14" 20¹⁄₂" 24⁵⁄₈" 28"

FP2256

min. clearance no hood

Example: A mantel may project from the wall a maximum

of 21⁄2" at a minimum of 14" above the opening, and a

maximum of 6" at a minimum of 201⁄2" above the opening.

Figure 3.4 - Minimum Mantel Clearance with No Hood —

NB18

Heat

Resistant

Material

Heater in

Fireplace or

Firebox

FP2257

min clear with hood

10"

8"

6"

2¹⁄₂"

8" 14¹⁄₂" 18⁵⁄₈" 22¹⁄₂" 26"

12"

Heat

Resistant

Material

Heater in

Fireplace or

Firebox

Hood

Figure 3.6 -Minimum Mantel Clearance with No Hood —

NB18/24

Example: The bottom of the mantel may project from the

wall a maximum of 10" at a minimum of 28" above the

opening.

10" or less

12" min.

FP2260

min mantel 24

28"

Heat

Resistant

Material

Heater in

Fireplace or

Firebox

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/2312

The gas log heater must be installed at least 13⁄8" above

any combustible ooring material, such as carpeting or

tile, which is closer than 14" to the base of the replace.

The minimum distance must be maintained from the top

surface of carpeting, tile, etc. Figure 3.7

OR

The gas log heater may be installed nearer to the oor if a

minimum of 14" of noncombustible material such as slate

or marble is installed between the base of the replace and

the combustible ooring. Figure 3.8

Figure 3.7 - Minimum Clearance above Combustible Flooring

FP2261

Min comb floor clear

Heater in Fireplace

or Firebox

Combustible

Material

13⁄8" Minimum

Figure 3.8 - Minimum Clearance above Combustible Flooring with Noncom-

bustible Material Installed at Base of Fireplace

FP2262

Min noncomb floor clearance

14” Minimum

Heater in Fireplace

or Firebox

Combustible

Material

This Distance

May Now be

Less Than 13⁄8"

Vinyl Flooring

Vinyl Flooring is sensitive to heat. A 14 inch minimum

depth hearth extension is recommended when using vinyl

ooring up to the wall. See Figure 3.8.

NOTICE: Clearances that do not meet the minimum

guidelines could result in damage or buckling to the vinyl

ooring and is done at the installer’s risk.

Hearth & Home Technologies does not recommend adhe-

sive based vinyl ooring due to thermal expansion. Float-

ing-style ooring can be used, but will reach temperatures

up to 110°F in a room with ambient temperature of 70°F.

Consult ooring specications to ensure compatibility.

Minimum Hearth Requirement - 0 in.

Note: For installations with vinyl ooring,

special clearance recommendations

apply.

Minimum Hearth Requirement -14 in.

Note: For installations with vinyl ooring,

special clearance recommendations

apply.

13

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

Before Fully Installing the Unit:

• Turn OFF the gas supply to the replace or rebox.

• Seal any fresh air vents and/or ash clean-out doors

located on the oor or wall of the replace. If left

unsealed, drafting may cause pilot outage or soot-

ing. Use a heat resistant sealant. Do not seal the

chimney ue damper.

Vented Application Installations —

NB & NBIF Only

Intellire Plus ODS (IFP) and millivolt controlled gas logs

may be installed as a vented decorative log set in com-

pliance with ANSI Z21.60 and National Fuel Gas Code,

Section 6.6. Since, the gas logs are operated with the

damper open, non-combustible material and minimum

mantel requirements do not apply.

B. Before installing the appliance:

• Turn off gas supply to replace or rebox.

• Have the replace oor and chimney professionally

cleaned to remove ashes, soot, creosote or other

obstructions. Have this cleaning performed annually

after installation.

• Seal any fresh air vents or ash clean-out doors

located on oor or wall of replace. If not, drafting

may cause pilot outage or sooting. Use a heat-

resistant sealant.

Install and operate the appliance as directed in this

manual.

C. Damper stop installation:

A damper stop must be provided with the unit. Contact your

dealer to obtain one. The damper stop must be installed as

shown in Figure 3.9 to prevent full closure of the replace

damper blade and provide a minimum 29 square inch ue

opening.

Figure 3.9 - Damper Stop Installation.

FP2263

Damper stop install

Damper Stop

Damper

Before installing in a solid fuel burning replace,

The chimney ue and rebox must be cleaned of

soot, creosote, ashes and loose paint by a qualied

chimney cleaner.

WARNING

This log set can be installed in a solid fuel burning

fireplace (masonry fireplace or manufactured

replace) with a working ue and constructed of

non combustible material or in a vent-free rebox.

Exception: DO NOT install this appliance in a factory-

built replace that includes instructions stating that

it has not been tested or should not be used with

unvented gas logs. This log set may be installed as

a vented log set.

WARNING

The use of thermostat is not allowed on vented log

application. It is only allowed on unvented room

heater classication.

WARNING

When this log set is installed in a vented application,

the damper must be clamped to be fully open.

WARNING

NOTE: The use of a thermostat is prohibited in vented

log installations.

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/2314

Figure 3.10 - Securing Heater to Floor of Fireplace/Firebox

D. Assembly Procedure

1. Center the burner assembly inside the fireplace or

firebox. Make certain that the front of the burner

assembly sits inside the front edge of the replace or

the rebox.

2. Anchor holes are located on the right and left sides of the

brackets attached to the engine base. After centering

the burner assembly correctly, mark the holes on the

replace or rebox oor. Drill two (2) 5/32” diameter holes

approximately 1 ¼” deep. Anchor the two anchoring

screws shipped with the unit using ¼” hex head chuck

and secure the burner assembly to the replace through

the holes drilled earlier. See Figure 3.10.

3. Anchor the grate to the replace/rebox oor using the

screws provided. See Figure 3.10.

Proper installation of the grate is essential to prevent

any movement of the gas logs and controls during

operation.

You must secure the gas log heater to the replace

oor. If not, the entire unit may move when you

adjust the controls. Movement of unit may cause

shifting of the gas logs which leads to sooting and

improper burning. Grate movement could cause a

gas leak.

Special care is required if you are installing the unit

into a sunken replace. You must raise the replace

oor to allow access to gas log controls. This will

ensure adequate air ow and guard against sooting.

Raise the fireplace floor using noncombustible

materials, as described in Placement in a Fireplace

with Restrictive Barrier on Page 6.

WARNING

Screw

Anchor Hole

15

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

4 4 Gas Information

A. Gas Line Connection

NOTICE: A qualied gas appliance installer must connect

the heater to the gas supply. Consult all local codes.

IMPORTANT: Hold heater valve rmly with a wrench to

prevent movement when connecting to inlet pipe.

Always use an external regulator for all propane/LPG

heaters and high pressure one to two-pound systems

only, to reduce the supply tank pressure to a maximum of

13" w.c. This is in addition to the internal regulator in the

heater valve.

The heater gas inlet connection is a 3/8" NPT at the valve.

On all control type units, the inlet connection is on the right

side of unit. To connect from the opposite side, route the

pipe around the back portion of the unit.

When tightening up the joint to the valve, hold the valve

securely to prevent movement.

Test all gas joints from the gas meter to the heater valve for

leaks using a gas analyzer or soap and water solution after

completing connection. DO NOT USE AN OPEN FLAME.

Check the gas pressure with the appliance burning and

the control set to HIGH.

Use new black iron or steel pipe. Internally tinned

copper or copper tubing can be used per National

Fuel Code, section 2.6.3, providing gas meets

hydrogen sulde limits, and where permitted by local

codes. Gas piping system must be sized to provide

minimum inlet pressure (Listed on Data Plate) at the

maximum ow rate (BTU/hr). Undue pressure loss

will occur if the pipe is too small.

A manual shutoff valve must be installed upstream

of the appliance. Union tee and plugged 1/8" NPT

pressure tapping point should be installed upstream

of the appliance.

WARNING

Connecting directly to an unregulated propane/

LPG tank can cause an explosion.

WARNING

CHECK GAS TYPE: The gas supply must be the

same as stated on the heater’s rating plate. If the

gas supply is different, DO NOT INSTALL THE

HEATER. Contact your dealer for the correct model.

WARNING

Figure 4.1 Gas Connection

B. Fuel Type

• This appliance is equipped for either natural or propane

gas. Field conversion is not permitted.

• Make sure the appliance is compatible with available gas

types.

C. Gas Pressure

• Optimum appliance performance requires proper input

pressures.

• Gas line sizing requirements will be determined in ANSI

Z223.1 National Fuel Gas Code in the USA.

• Pressure requirements are:

NATURAL PROPANE (LP)

Inlet Minimum 5.0" w.c. 11.0" w.c.

Inlet Maximum 10.5" w.c. 13.0" w.c.

Gas Valve Manifold

Pressure Setting

3.5" w.c. 10" w.c.

Pilot Regulator 3.5" w.c. —

WARNING! Risk of Fire or Explosion! High pressure

will damage valve. Low pressure could cause explosion.

• Verify inlet pressures. Verify minimum pressures when

other household gas appliances are operating.

• Install regulator upstream of valve if line pressure is

greater than 1/2 psig.

• Valve pressure taps are accessible by removing the right

side log. See Figure 4.2.

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/2316

Note: Have the gas supply line installed in accordance with

local codes, if any. If not, follow ANSI Z223.1. Installation

should be done by a qualied installer approved and/or

licensed as required by the locality. (In the Commonwealth

of Massachusetts installation must be performed by a

licensed plumber or gas tter).

Fire Risk.

Explosion Hazard.

High pressure will damage valve.

• Disconnect gas supply piping BEFORE

pressure testing gas line at test pressures

above 1/2 psig.

• Close the manual shutoff valve BEFORE

pressure testing gas line at test pressures

equal to or less than 1/2 psig.

WARNING

Depending upon local code, a manual gas shutoff, in

a readily accessible area may be required and located

upstream from the appliance.

D. Gas Service Access

FP2266

valve

Figure 4.2 - Pressure Test Point Location Millivolt Control

Test Port “OUT”

Intellire Plus ODS (IFP)

Check the gas pressure with the appliance burning and

the control set to HIGH.

The valve regulator controls the burner pressure which

should be checked at the pressure test point.

Turn captured screw counterclockwise two or three turns

and then place tubing to pressure gauge over test point.

Use test point “A” closest to gas inlet. After taking pres-

sure reading, be sure and turn captured screw clockwise

rmly to reseal. Do not over torque. Check for gas leaks.

See Figure 4.3.

Figure 4.3 Pressure Test Point Location

Test Port ‘A’

E. Check Gas Pressure

Millivolt

The valve regulator controls the burner pressure which

should be checked at the pressure test point.

Turn captured screw counter clockwise two or three turns

and then place tubing to pressure gauge over test point

(use test point “OUT” closest to control knob). After taking

pressure reading, be sure and turn captured screw clock-

wise rmly to re-seal. Do no over torque. Check for gas

leaks. See Figure 4.2.

17

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

5 5 Electrical Information

CAUTION

Label all wires before disconnecting when

servicing controls. Wiring errors can cause

improper and dangerous operation.

Do not connect wall switch to 110 V circuit.

WARNING

A. General Information

Electrical Service and Repair

WARNING! Risk of Shock! Label all wires prior to dis-

connection when servicing controls. Wiring errors can

cause improper and dangerous operation. Verify proper

operation after servicing.

WARNING! Risk of Shock! Replace damaged wire with

type 105º C rated wire. Wire must have high temperature

insulation.

Accessories Requirements

• This appliance may be used with a wall switch, or optional

wall mounted thermostat and/or a remote control.

Wiring for optional Hearth & Home Technologies approved

accessories should be done now to avoid reconstruction.

Follow instructions that come with those accessories.

►

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/2318

The millivolt valve is a self-powered combination gas con-

trol THAT DOES NOT REQUIRE 110 VAC TO OPERATE.

B. Connect Optional Wall Switch or

Thermostat (vent free application only)

1. Use 18 awg, two-wire cable, 15 feet maximum length.

2. At one end of the cable, connect both wires to the wall

switch or thermostat. At the other end, connect one

wire to TP/TH and one wire to TH, using fork terminal

or connect the wall switch/thermostat to the two male

(0.25") terminals on the left side of the unit. The color

of the wires does not matter.

Figure 5.1 - Wiring Diagram

NOTE: Log switch wires are not factory connected. Connect log switch wires to the TP/TH and TH valve

terminals as shown.

FP2267

wiring diagram

Log Switch

On/Off Switch

or Optional Wall

Switch, Remote

or T-Stat

ODS Pilot

Millivolt

Valve

TH = 3

TP = 1

TP/TH = 2

ODS

Pilot

CAUTION

Label all wires prior to disconnection when

servicing controls. Wiring errors can cause

improper and dangerous operation. Verify

proper operation after servicing.

Thermopile

Wires

19

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/23

C. Connect Remote Receiver

1. Set remote receiver. See instructions included in

receiver kit.

2. Unplug the two terminals for the log switch from the

valve, connect the piggy back terminal of the receiver

to the TH and TP/TH on the valve. Slide the terminal

of the log switch onto the piggy back terminal on the

receiver

NOTE: Do not allow wires to touch grate or burner.

NOTE: Heat reduces battery life. You can protect the

receiver and extend battery life by mounting receiver

in wall or other location outside the replace.

D. Check System Operation

The millivolt system and individual components may be

checked with a millivolt meter having a 0-1000 mV range.

Conduct each check shown in chart below by connecting

meter test leads to terminals as indicated.

1. Complete Millivolt System Check

(“A” Reading - Thermostat contacts CLOSED -

Control Knob “ON” - Main burner should turn

ON)

a. If the reading is more than 175 millivolts and the

automatic valve still does not come on, replace the

control.

b. If the closed circuit reading (“A” reading) is less than

175 millivolts, determine cause for low reading, pro-

ceed to Section B below.

2. Thermopile Output Reading Check

(“B” Reading - Thermostat contacts OPEN - Main

burner OFF)

1. Check gas pressure to the unit. If gas pressure is

within minimum and maximum on data plate, then

check pilot voltage, 500 millivolts minimum. If the

minimum millivolt reading is not obtainable, replace

pilot.

Figure 5.2 - Installing Remote Receiver

Check

Test To Test

Connect Meter Leads

to Terminals

Switch or Thermostat

Contacts Meter Should Read

A Complete System 2 and 3 Closed Minimum 175

BThermopile Output 1 and 2 Open Minimum 500

TP/TH = 2

TP = 1

TH = 3

Remote Wire

Connectors

Remote Wire

Connectors

Valve

Remote Receiver

Monessen • Natural Blaze Owner’s /Installation Manual • 4619-900 Rev. J • 01/2320

E. Wiring Requirements

Intellire™ Plus ODS Ignition System Wiring

• Refer to Figure 5.4, IFP ODS Wiring Diagram.

• This appliance is equipped with an Intellire™ Plus

control valve which operates on a 6 volt/1.5 AMP system.

• Install 4 AA cell batteries into the battery pack before use.

See Figure 5.3

THERMOCOUPLE MODULE

PILOT

19093-Thermocouple Module Wire

CONTROL MODULE

I

S

BATTERY PACK

6V DC

RED

BLACK

BROWN

BROWN/RED

OPTIONAL ON/OFF

SWITCH

RC300 4.5V DC

(AAA X 3)

FLAME

MODULATION

BLACK

(GROUND)

ORANGE

(PILOT)

GREEN

(MAIN)

THERMOCOUPLE

ORANGE

IGNITOR

GRAY

19026-GM931 Control Box ODS

THERMOCOUPLE

IGNITOR

WHITE

RED

Figure 5.4 IntelliFire™ Plus ODS Wiring Diagram (Battery Only)

Figure 5.3 Battery Pack Location

Battery Pack

►

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MHSC Post October 2019 Owner's manual

MHSC Post October 2019 Owner's manual

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